The function of BRIP1 (BRCA1 interacting DNA helicase 1, Ensembl gene identifier ENSG00000136492) is as follows. DNA-dependent ATPase and 5'-3' DNA helicase required for the maintenance of chromosomal stability (PubMed:11301010, PubMed:14983014, PubMed:16116421, PubMed:16153896, PubMed:17596542, PubMed:36608669). Acts late in the Fanconi anemia pathway, after FANCD2 ubiquitination (PubMed:14983014, PubMed:16153896). Involved in the repair of DNA double-strand breaks by homologous recombination in a manner that depends on its association with BRCA1 (PubMed:14983014, PubMed:16153896). Involved in the repair of abasic sites at replication forks by promoting the degradation of DNA-protein cross-links: acts by catalyzing unfolding of HMCES DNA-protein cross-link via its helicase activity, exposing the underlying DNA and enabling cleavage of the DNA- protein adduct by the SPRTN metalloprotease (PubMed:16116421, PubMed:36608669). Can unwind RNA:DNA substrates (PubMed:14983014). Unwinds G-quadruplex DNA; unwinding requires a 5'-single stranded tail (PubMed:18426915, PubMed:20639400). {ECO:0000269|PubMed:11301010, ECO:0000269|PubMed:14983014, ECO:0000269|PubMed:16116421, ECO:0000269|PubMed:16153896, ECO:0000269|PubMed:17596542, ECO:0000269|PubMed:18426915, ECO:0000269|PubMed:20639400, ECO:0000269|PubMed:36608669}.